88 Psyche [June 



TABLE OF MALES OF THE NORTH AMERICAN SPECIES 



OF THE GENUS ASYNDETUS WITH DESCRIPTIONS 



OF SIX NEW SPECIES. 



ByM. C.VanDuzee. 



Buffalo, New York. 



This little genus is distinguished from Diaphorus by the latter 

 part of the fourth vein being evanescent, and the costa ending at 

 the tip of the third vein. The males of most of the species have 

 conspicuous bristles at the tip of the abdomen as in Diaphorus. 



The species described below are mostly from the western states 

 where it is likely many new forms will yet be found. 



Table of Males. 



1 . All tibiae partly or wholly yellow 2 



Hind tibiae black 5 



2. Fore tarsi modified, hind tibiae blackened at base 3 



Fore tarsi normal, hind tibiae blackened at tip 4 



3. First joint of fore tarsi incrassated ammophilus Loew. 



Second joint of fore tarsi with clavate, halter-like, yellow ap- 

 pendages appendiculatus Loew. 



4. Front and face very wide and covered with silvery pollen, palpi 



black (Fig. 4) latus sp. nov. 



Ground color of front and face showing through the white pollen ; 

 palpi rather large, white (Fig. 5) caudatus sp. nov. 



5. Fore and middle tibiae black or brown 6 



Fore tibiae yellowish, sometimes the middle ones also 8 



6. Third antennal joint small, rounded, not longer than wide. 7 

 Third antennal joint large, twice as long as wide (Fig. 3) 



nigripes sp. nov. 



7. Mesonotum with a brown-dusted median vitta between two 



bluish-gray ones, length 2.5 mm fratellus Aid. 



Mesonotum not vittate interriiptus Loew. 



8. Third antennal joint somewhat quadrilateral in outline 10 



Third antennal joint rounded below and with a point at tip . . 9 



9. Third antennal joint nearly straight above, fore tibiae with short 



hair and very small scattering bristles (Fig. 2) texanus sp. nov. 



